Mitt Romney wants the U.S. to build a fence to keep out illegal immigrants. Herman Cain suggested constructing an electrified “Great Wall of China” along the Mexican border. And Rick Perry, who once called the fence idea “idiocy,” is accusing Romney of employing illegal workers.

The issue of how to combat illegal immigration has emerged as the clearest dividing line in a crowded Republican presidential field, even as the weak economy dominates surveys of voters’ concerns.

The fight became personal last night, when Perry accused Romney, a former governor of Massachusetts, of hiding the presence of illegal immigrant workers on his property, during a nationally televised CNN debate in Las Vegas.

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